28078299749 has 2 divisors, whose sum is σ = 28078299750. Its totient is φ = 28078299748.

The previous prime is 28078299721. The next prime is 28078299791. The reversal of 28078299749 is 94799287082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27483671524 + 594628225 = 165782^2 + 24385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28078299749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28078299649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14039149874 + 14039149875.

It is an arithmetic number, because the mean of its divisors is an integer number (14039149875).

Almost surely, 2^28078299749 is an apocalyptic number.

It is an amenable number.

28078299749 is a deficient number, since it is larger than the sum of its proper divisors (1).

28078299749 is an equidigital number, since it uses as much as digits as its factorization.

28078299749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36578304, while the sum is 65.

The spelling of 28078299749 in words is "twenty-eight billion, seventy-eight million, two hundred ninety-nine thousand, seven hundred forty-nine".